What to do with your pool after a power outage

The first priority after power restoration is confirming the pump has started. Walk to the equipment pad and listen. A running pump has a distinct hum or motor tone. Check the pump basket lid for a water prime and confirm flow at the returns. If the pump is not running and the breaker is in the on position, check for a GFCI trip at the breaker box or at the equipment pad itself. Some pools have a GFCI breaker at the panel and another protection point at a disconnect box near the equipment.

If the pump started but flow seems low, check the skimmer and pump baskets. Power outages and storms often coincide with wind and debris events; baskets can pack during the outage period. Clear both baskets and confirm flow returns to normal before proceeding.

Mechanical timers (the round clock-style timers with physical pins) typically keep time through brief outages using a battery backup or flywheel, but longer outages will cause them to lose time accuracy. Check that the current time displayed matches the actual time, and confirm the on/off pins are still set at the correct positions. A timer running two hours slow will run your pump at the wrong times for days until noticed.

Digital timers and automation controllers are more capable but also more vulnerable to reset events. After an outage, check the controller screen for any error messages or time discrepancy. Confirm the pump schedule, any auxiliary function schedules (spa heater, water features, lighting), and the salt cell output setting. Many automation systems have an event log; reviewing it can confirm what happened during the outage.

Variable speed pumps rely on a programmed schedule of speed steps and run times stored in the pump controller's memory. On many popular VSP models, this memory is volatile: an extended outage or a power surge can partially or fully wipe the saved programs. The pump may come back on after the outage running at a default high speed continuously, which wastes energy and is not the intended operation.

After any significant outage, go to the VSP controller and confirm the schedule is intact. Most VSP controllers display the current speed and program mode; compare it to your normal settings. If the program is gone, you will need to re-enter the speed step schedule manually. It is worth keeping a written note of your VSP program settings on the inside of the equipment pad door or in a maintenance log.

Salt chlorine generators are sensitive to power events. After an outage, check the salt cell controller for fault codes. Common post-outage codes include low-flow warnings (triggered if the pump was off long enough for the flow sensor to reset incorrectly), salt level out of range (if the display controller lost calibration), and inspect cell alerts. Most of these codes require a manual acknowledge or reset on the controller.

If the salt cell goes through a hard reset, it may default to a lower output percentage than your normal setting. Check the output percentage setting and restore it to your usual value. If the cell had been running cleanly and generates a persistent fault code after the outage that a reset does not clear, there may be surge damage to the control board; this requires a professional diagnosis.

Cold-weather outages are the highest-stakes scenario for pool equipment. Most pools with automation controllers have a freeze protection mode that activates when ambient temperature drops below a threshold (typically 38-40 degrees Fahrenheit) and runs the pump at full speed to keep water moving through the plumbing. If the controller loses power during a freeze event, the freeze protection cannot activate, and static water in the pipes, pump, filter, and heater can freeze and crack.

If the power goes out during a freeze event and the automation controller is offline, the immediate action is to manually turn the pump on at the breaker and confirm it is running. Manual operation bypasses the frozen controller. Run the pump at the highest speed available. Open any valves that may be closed and allow flow to reach all plumbing runs. If the equipment pad is extremely cold, wrap the pump and filter with moving blankets or insulating wrap to slow heat loss while the pump runs.

Lightning-associated power surges are a real and underappreciated damage source for pool electronics. A single nearby lightning strike can send a voltage spike through the power lines that fries the control board on a VSP, burns out the salt cell transformer, or damages the automation controller. This type of damage is not always covered under standard homeowner's insurance without specific equipment coverage.

Dedicated pool equipment surge protectors are available and can be installed at the equipment pad. Whole-house surge protectors installed at the main panel provide broader coverage. Given the cost of automation controllers (often 500 to 2000 dollars) and VSP pumps (500 to 1500 dollars), surge protection is a cost-effective precaution for Austin homeowners who experience frequent summer electrical storms.